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Anonymization (Mix) networks are based on the delivery of messages through a sequence of overlay hops devised to avoid end-to-end linkage of the information, thus protecting users' identities (when needed) and privacy. Most Mix networks overlays are based on hops based either on TLS or directly built by proprietary applications. In this paper, the authors analyze the methodology chosen so far to build Mix networks and tor in particular and then show, through experiments supported by a theoretical explanation, that overlays based on congestion-controlled transport level tunnels may incur in devastating performance degradation.
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